This guide released by the Passivhaus Trust, highlights the key aspects of designing to the Passivhaus standard and lists the do’s and don’t’s on how to successfully build a Passivhaus. Chapter 4 of the guide is dedicated to airtightness; It discusses the Passivhaus requirement for an excellent level of airtightness and explain the principles of airtightness testing, highlighting where dwellings leak and how to go about meeting the airtightness target for a project.

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